js-utils/docs/api/js-utils.setorpush.md

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[Home](./index.md) &gt; [@apextoaster/js-utils](./js-utils.md) &gt; [setOrPush](./js-utils.setorpush.md)

## setOrPush() function

Set a map key to a new array or push to the existing value.

<b>Signature:</b>

```typescript
export declare function setOrPush<TKey, TVal>(map: Map<TKey, ReadonlyArray<TVal>>, key: TKey, val: TVal | ReadonlyArray<TVal>): Map<TKey, ReadonlyArray<TVal>>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  map | Map&lt;TKey, ReadonlyArray&lt;TVal&gt;&gt; | The destination map and source of existing values. |
|  key | TKey | The key to get and set. |
|  val | TVal \| ReadonlyArray&lt;TVal&gt; | The value to add. |

<b>Returns:</b>

Map&lt;TKey, ReadonlyArray&lt;TVal&gt;&gt;